Rebalancing your portfolio
The yearly check that brings your mix of stocks, bonds and cash back to the one you chose, at the lowest cost.
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Time: 1 to 2 hours, once a year
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Clear all the checkmarks?
Your target mix
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Without a written target, you can’t tell whether you’ve drifted.
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Investor.gov notes that many experts suggest every six or twelve months, or a set percentage of drift.
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FINRA suggests considering rebalancing as part of a yearly review of your investments.
On check day
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Count every account: workplace plan, IRA or ISA, and taxable accounts.
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Trades can cost fees and trigger taxes, so small moves often aren’t worth it.
Get back in balance
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You sell nothing, so there’s no tax to pay. It’s one of the three ways investor.gov and FINRA describe.
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FINRA notes that selling at a gain in a taxable account can mean capital gains tax. In the UK, there’s no Capital Gains Tax on shares in an ISA.
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Held more than a year, it’s taxed at 0%, 15% or 20%; one year or less, as ordinary income.
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That’s a wash sale, and the IRS won’t let you deduct the loss.
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Gains above £3,000 a year can be taxed. If you buy the same shares back within 30 days, special rules set the cost.
Afterward
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FINRA and investor.gov describe lifecycle, or target date, funds, which shift their mix gradually over the years.
Back in balance
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Good to know
- Rebalancing keeps the level of risk you chose. It isn’t a way to earn more, and it can mean selling what did best.
- No mix, fund or product is recommended here: the right mix depends on your goals and your timeline.
- Tax rules are as of September 30, 2026, and they differ from country to country: outside the US and the UK, check your own country’s rules.
Frequently asked questions
How often should I rebalance?
There’s no official schedule. Investor.gov notes that many experts suggest every six or twelve months, or whenever a part drifts past a set percentage, and FINRA suggests considering it in a yearly review. Pick one rule and stick to it.
Do I pay tax when I rebalance?
Only if you sell at a gain in a taxable account, as FINRA points out. If you send new money to the part that has fallen behind, you sell nothing.
What’s a wash sale?
In the US, if you sell stock or securities at a loss and buy substantially identical ones within 30 days before or after the sale, the IRS doesn’t let you deduct that loss. It matters if you sell losers while rebalancing.
Next step
I’m not an accountant or a financial advisor. This is an estimate, for information only. Check with a professional before you decide.
- The calculatorCompound interest
- The checklistMonthly investing
- The short guideMonthly investing, simply explained
- The routeStarting to save
Sources
- Investor.gov (SEC) — Beginners’ guide to asset allocation, diversification and rebalancing
- FINRA — Asset allocation and diversification
- IRS — Publication 550, Investment income and expenses (wash sales)
- IRS — Topic no. 409, Capital gains and losses
- GOV.UK — Capital Gains Tax: allowances
- GOV.UK — Tax when you sell shares: selling shares in the same company
- GOV.UK — How ISAs work
For the right mix for you and the tax side of selling, talk to a qualified, independent financial advisor or a tax professional.